Engine General Information and Diagnosis: 1A-48
C15 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Remove the throttle body. Refer to “Throttle Body
Removal and Installation in Section 1D (Page 1D-10)”.
3) Check the ECT sensor coupler (1) for loose or poor
contacts.
If OK, then measure the ECT sensor input voltage.
4) Disconnect the ECT sensor coupler and turn the ignition
switch ON.
5) Measure the input voltage between the B/Bl wire “A” and
ground.
Also the B/Bl wire “A” and B/Br wire “B”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
ECT sensor input voltage
4.5 – 5.5 V
((+) terminal: B/Bl – (–) terminal: Ground, (+)
terminal: B/Bl – (–) terminal: B/Br)
Go to Step 2. Short circuit in the B/Bl
wire or B/Br wire.
1
I944H1110031-01
(A)
“A”
“B”
I944H1110172-01
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